<template>
  <el-breadcrumb
    class="app-breadcrumb"
    separator="/">
    <transition-group name="breadcrumb">
      <el-breadcrumb-item
        v-for="(item,index) in levelList"
        :key="item.path">
        <span
          v-if="item.redirect==='noredirect'||index==levelList.length-1"
          class="no-redirect">{{
          generateTitle(item.meta.title) }}</span>
        <a
          v-else
          @click.prevent="handleLink(item)">{{ generateTitle(item.meta.title) }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
import {generateTitle} from '@/utils/i18n'
import pathToRegexp from 'path-to-regexp'

export default {
  data() {
    return {
      levelList: null
    }
  },
  watch: {
    $route() {
      this.getBreadcrumb()
    }
  },
  created() {
    this.getBreadcrumb()
  },
  methods: {
    generateTitle,
    getBreadcrumb() {
      let matched = this.$route.matched.filter(item => item.name)

      const first = matched[0]
      // if (first && first.name.trim().toLocaleLowerCase() !== 'Dashboard'.toLocaleLowerCase()) {
      if (first && first.name.trim().toLocaleLowerCase() !== '首页'.toLocaleLowerCase()) {
        matched = [{path: '/dashboard', meta: {title: 'dashboard'}}].concat(matched)
      }

      this.levelList = matched.filter(item => item.meta && item.meta.title && item.meta.breadcrumb !== false)
    },
    pathCompile(path) {
      // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
      const {params} = this.$route
      var toPath = pathToRegexp.compile(path)
      return toPath(params)
    },
    handleLink(item) {
      const {redirect, path} = item
      if (redirect) {
        this.$router.push(redirect)
        return
      }
      this.$router.push(this.pathCompile(path))
    }
  }
}
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
  .app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 8px;
    .no-redirect {
      color: #97a8be;
      cursor: text;
    }
  }
</style>
